HeapSupplements are now just Supplements.

third_party/WebKit/Source/modules/webusb/NavigatorUSB.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NavigatorUSB_h
 #define NavigatorUSB_h
 
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Navigator;
 class USB;
 
 class NavigatorUSB final
     : public GarbageCollected<NavigatorUSB>
-    , public HeapSupplement<Navigator> {
+    , public Supplement<Navigator> {
     USING_GARBAGE_COLLECTED_MIXIN(NavigatorUSB);
 public:
     // Gets, or creates, NavigatorUSB supplement on Navigator.
     // See platform/Supplementable.h
     static NavigatorUSB& from(Navigator&);
 
     static USB* usb(Navigator&);
     USB* usb();
 
     DECLARE_TRACE();
 
 private:
     explicit NavigatorUSB(Navigator&);
     static const char* supplementName();
 
     Member<USB> m_usb;
 };
 
 } // namespace blink
 
 #endif // NavigatorUSB_h